Useless MTN

I have a contract with Mtn and around end January early February I received a call regarding my account saying that an upgrade of the account not phone could be done at No extra charge.. Cool, I said go ahead. Ha.. End of February comes around and mtn debit my account R505 when I usually pay R399. I try phoning mtn 135... Omg what a freaking joke. You get passed around from department to department having to tell your story 50 times and they still can't help you. Eventually after a few days of this nonsense, I'm so frustrated and ****ed off I asked to speak to a manager cause no one has authority to do anything. I get put through to Mervin Pillay... He listens to my story and said he will escalate it and get my money refunded back... Cool... A week later I still haven't received my refund, I tried phoning again... He's only starting work at 1pm..leave a message to call me back... I'm still waiting.. End of March pulls around and I get debited another R443. I try phoning Mervin again, get told same story. He emails me and said all is in order, however it's not and I still haven't received my refund from now 2 months. I asked him to get someone higher to contact me as I'm not getting any joy out of him... A week has gone by and I'm still waiting. Mtn owe me R150. If I owed you people that money, you'd take me to court. I cannot believe how pathetic the service is from mtn. Nobody can help you with anything and they not scared to tell you that. How useless